Question Answers

A pencil 10 cm long is placed along the axis of a convex lens of focal length 10 cm, such that the middle point of the pencil is at a distance of 20 cm from the lens. Find the length of the image of the pencil. A pencil 10 cm long is placed along the [...]

Double convex lenses are to be manufactured from a glass of refractive index 1.5, with both faces of the same radius of curvature. What is the radius of curvature required if the focal length of the lens Double convex lenses are to be manufactured from a glass of refractive index 1.5 with both faces of [...]

Two concentric coplanar circular loops of radii r1 and r2 carry currents of respectively i1 and i2 in opposite direction (one clockwise and the other anticlockwise). The magnetic induction at the centre of the loops is half that due to i1 alone at the centre. if r2 = 2r1. the value of i2/i1 is A [...]

A convex lens is made of glass of refractive index 1.5. If radius of curvature of each of its two surfaces is 20 cm, find the ratio of the power of the lens, when placed in air to its power, when immersed inside a liquid A convex lens is made of glass of refractive index [...]

What is the relation between refractive indices mu, mu1, mu2, if the behavior of light rays is as shown in Figs.(a) and (b)? if the behavior of light rays is as shown in Figs.(a) and (b)? mu1 mu2 What is the relation between refractive indices mu September 9, 2020 Category: Uncategorised (JEE Advanced Physics by [...]

A netural point is obtained at the center of a vertical circular coil carrying current. The angle between the plane of the coil and the magnetic meridian is A netural point is obtained at the center of a vertical circular coil carrying current. The angle between the plane of the coil and the magnetic meridian [...]

A glass or glycerin convex lens of refractive index 3/2 has got a focal length equal to 50 cm. Find the focal length of the lens, if it is immersed in ethyl alcohol of refractive index 1.36. A glass or glycerin convex lens of refractive index 3/2 has got a focal length equal to 50 [...]

A thin wire of length l is carrying a constant current. The wire is bent to form a circular coil. If radius of the coil, thus formed, is equal to R and number of turns in it is equal to n, then which of the following graphs represent (s) variation of magnetic field induction (B) [...]

There are two spherical surfaces of radii R1 = 30 cm and R2 = 60 cm. In how many ways these surfaces may be arranged to get different lenses. If all the lenses are made of glass (mu = 1.5), There are two spherical surfaces of radii R1 = 30 cm and R2 = 60 [...]

An electron is revolving round a proton, producing a magnetic field of 16 W/m^2 n in a circular oribit of radius 1 A. Its angular velocity will be An electron is revolving round a proton producing a magnetic field of 16 W/m^2 n in a circular oribit of radius 1 A. Its angular velocity will [...]